复杂的管道可采用建立背压的方法进行清管、测径。
Complex pipe can be established by the method of back pressure pigging, caliper.
而管板是管壳式换热器中最重要也是最复杂的承压部件。
Tubesheet is the most important and complicated part of tube-and-shell heat exchanger.
并且证明悬料区的总压降可以近似等于立管的压降。
The total pressure drop in hung-up regime is approximately equal to that in the standpipe.
而管板是管壳式换热器中最重要也是最复杂的承压部件。
Tubesheet is the most important and complicated part of shell-and-tube heat exchanger.
排水立管的上部和下部都存在正压和负压。
Positive and negative pressure existed in the upper and lower drainage pipes.
因波纹管是四氟材料制作的，压力、压差大，容易导致波纹管破裂。
PTFE material for corrugated pipe is made, pressure, pressure large, easily lead to broken bellows.
因波纹管是四氟材料制作的，压力、压差大，容易导致波纹管破裂。
PTFE material for corrugated pipe is made, pressure, pressure large, easily lead to broken bellows.
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